Regarding annulment of marriage and RCR petition

I had married a girl under special marriage act 1954 on October 2013.But after the marriage the girl told that she will convince her parents and come back to my house and the marriage will b held socially.any way she was connected to me comming to my house and relationship continued till June 2017.But we did'nt stayed together since the inception of marriage.But I was taking care of all her needs.suddenly she came and asked me for divorce.Now last month she has filled for the marriage to b null and void under section 25 of Special marriage act.The grounds she has filled in the petition is totally false.She has written that me and my mother mix something in cold drinks and take her sign cunningly.She was not in love with me and treated me as friend.She also mentioned that she was not knowing about the marriage occured earlier and only came to know when i showed her the certificate on last 27th June 2017.This is completely false allegations.The circumstances are different.She also mentioned that she was unaware of my qualification.so this marriage should be null and void.I want to knw the authentication of this petition and shall the court pass null and void order after 4 years of marriage registration?She also mentioned there we did'nt live together and have no physical relationship.I had filled a Restitution to conjugal rights petition too.I dnt want to give her divorce at all.And please guide us on the null and void petition she has filed.